Monoprice SWA-400 400-watt Subwoofer Amplifier with DSP and Presets - Monoprice.com
170mm * 144mm Black 400W Class AB Digital 2 Channel Black Aluminum Alloy High Power Car Audio AMP Subwoofer Amplifier|Enclosed Subwoofer Systems| - AliExpress
Kicker 46CXA400.1T CX Series mono subwoofer amplifier — 400 watts RMS x 1 at 1 ohm at Crutchfield
MB Quart dual 8" underseat subwoofer system powered by a 400 watt class-d amplifier Black MBQJT-SUBA-1 - Best Buy
TNP212D2 Dual 12" Subwoofer Enclosure And Amplifier Party Package | MTX Audio - Serious About Sound®
KICKER 46cxa400.1 CX Series Mono Amplifier - 400 Watt RMS X 1 at 1ohm for sale online | eBay
Boss Audio Systems Cube8 Car Subwoofer And Amp Package 400 Watt High Output Built In Amplifier 4 Ohm Voice Coil 8 Inch Subwoofer With Remote Control : Target